10.5

简单输出

#include<stdio.h>
int main()
{
      printf("小小的我有着大大的理想");
      return 0;
}

求圆的表面积

#include <stdio.h>                             
#define PI 3.14                                   
double calculateArea (int radius);    
int main ()                                            
 { 
      int cRadius =0;                            
      double Area =0.0; 
      printf("请输入圆的半径：\n"); 
      scanf("%d",&cRadius); 
      Area=calculateArea(cRadius); 
      printf("圆的面积是：%f\n", Area); 
      return 0 ;
 } 
double calculateArea (int radius)
{ 
       double result = PI*radius*radius; 
       return result;
}